The problem with your argument is that it applies just as well to all the T20 leagues around the world too. IPL has corruption. So why is T20 cricket not on a decline? Cricket boards did not just automatically become shambolic and corrupt one day. They are running in exactly the same way that they have always run.
The question to ask is why now? The answer of course lies in revenue models. Pretty much every industry in the world is facing a crisis of some sort
Traditional computer companies like Dell, HP, IBM
Camera companies like Fuji, Canon
Film/Entertainment industry
Shipping industry
Banking industry
You name it. The world is changing extremely fast and the traditional revenue models and structures are being dismantled. The problem facing cricket is that for it to adapt and look into different revenue models and be ahead of the curve, it requires coming together of all the cricket boards. This takes lots and lots and lots of time and the one thing about today's world is everything changes really fast.
ICC is trying. They have recognized the problem and they have been trying to come up with something to address these problems. But the process of meetings and government organisations coming together and the bureaucracy they bring means things take a very long time to move along. About two years ago ICC had a brilliant concept of pooling overseas cricket rights together so that all cricket is covered. Most boards agreed in principle but the work required to adjust that to their current broadcasting deals is just going to be very slow.
This is pretty much why they are always lagging behind. And that's ultimately why international cricket will decline
The world isn't changing fast enough for cricket. In a perfect world, we'd all be, and millions more, pay $15usd a month for our cricket subscriptions and get everything. And the money would go where the demand is. But its not.
Look at your examples:
IBM - they made two monumental errors.
1 They let Microsoft licence the software (huuuuuuuuuuuuge mistake) - it opened the door for clone PC.
2 They ignored the demand for portable computers: laptops.
Boohoo.
As a linux user on an HP laptop, I shed no tears for them. They sold their personal computer market to Lenovo, they already cashed out on their mistakes, besides what they still offer.
Dell and HP just face increased competition - that happens in all lucrative and profitable markets. People want a piece of the pie where they can surpass the barriers to entry.
Fuji and Canon, well they can just go back to being what they were pre the 1960's - specialists in camera and film. The writing on the wall for film companies was years and years ago when digital capture became mainstream. Of course people were going to take to it for its cost effectiveneess and its convenience. Bye bye Kodak. Hello smartphone with however many megapixels. But you wouldn't want to see a professional photographer using a smartphone would you?
But specialists and hobbyists will still need cameras and their fancy lenses. Just film will go back to being a rarity.
The film industry - they now get stream revenue, to go with with the still existing broadcast revenue and the decreased revenues from their peal as dvd/blu-ray becomes obsolete, well their costs are also less. They don't need to produce and burn the discs. Cinema is making a comeback - its still a popular cost effective date or venture out of the house. They may never recapture their glory days of Blockbuster video. Well so be it - technology changed the market exactly like it did the music industry. But concerts still sell tickets.
Banks are still making money - I don't get your point here. They'll forever make money. People need loans.
Shipping industry - has survived air cargo. If something has to go between continents, shipping remains the cheapest way to get there per kg. And globalisation is not ending soon.
Now if your examples rely on technological improvements, that ignores what is being demanded. And limited overs is in demand. But thats not an industrial crisis. That is boards and players balancing what they want to play and offer and get x revenue from, as against what is being demanded and prepared to pay for at y. There is no technology factor here. It is demand and supply.
The issue facing test cricket is one of demand as against t20. Not technology. But cricket still has far more global demand than camera film.