All android and ios phones sold in the last couple of years comes with ARM trustzone or secure enclave or something similar. It's already here.
The vast majority of Indian internet users are from mobile. It's a market lead by Xiaomi and other Chinese OEMs who sell phones that dies after a year or two with horrible ota updates. Some people downgrade, some use custom roms. But the majority just buys a new phone every 2-3 years. Or even 1 year. The poorest of people here buys iPhones with financing. Besides you don't need to buy expensive devices. Every GMS certified phone made in the last couple of years has it.
Now for actual computers, most are either prebuilts or laptops. They all come with secure boot since 2013?. The last Windows release without a mandatory TPM is going to be discontinued in 2025, microsoft will scare people into upgrading.
These are old machines. Any laptop made in the last 4 years will be able to access the new closed web so it won't be hard to replace of them.
I'm just hoping this "end of internet" happens really quickly. So that people would notice. One day people should wake up locked out of the web on their expensive devices. If it's a slow boil, we'll be too late to stop it. Again.