Yes PT isn't going away, there's too much of the industry world wide that is to heavily invested in PT for it to go away.
They are rapidly losing market share. There are a ton of DAWs out there, and perhaps too many, and I wouldn't be surprised to see some of them close shop, but it won't be Pro Tools. But a lot of them are eating into PT's market share.
PT has totally lost the consumer market though. They are basically a high end customer based DAW. The marketing of the product and worse the treatment of their customers. What is it $399 to upgrade to PT 11 for PT 10 users? That is a slap in the face to your customer base. The M-Audio bundles are a joke IMO. The interfaces are OK, you can get better for the money. They were really too late to the game supporting ASIO for Windows users. If they hadn't been so locked down from the beginning, it might be a different story now.
I imagine they spent a lot of money to get the 64 bit engine out, which is something they've needed to do for years. And that was an expenditure that had to happen for them to compete. That's probably a lot of the reason for their cash flow problem, and their ridiculous asking price for upgrades. Someone has to pay those developers.