Here is why
Not every project needs blockchain. Or not every blockchain project will survive.
True. There are so much projects that are now leaning on to blockchain and they all think that its part of the project though there's no need of it. There's no use for them to take part of it and for those projects that are failing in the mid-run, they only took the money of their investors.
In a project you need also a good businessplan and marketing.
Not all projects that has good business plan and marketing becomes successful.