more like the internet will finally be fixed. There is no reason gmail cannot encrypt my email and remove pii data, except that it will eat into advertising revenues. Its easy for companies like Google to take a stand on an easy thing like the government making it a bit harder to get visas, but when it comes to saying no to government requests for your email - they happily comply.
The number one benefit that Gmail touted when it launched was searchable email. That will break.
You're perfectly free to use E2E encryption on Gmail, and they are even trying to make it easy for you, though that project is evidently not as well staffed as the advertising org.
The inverted index could simply be built/live on client side. The cloud is then just a backup data storage. Encrypted email is downloaded, unencrypted and indexed on your laptop/phone etc.
To be clear, you're proposing that users download their entire email storage to their phones and browsers before they can search or spam filter their email? And you think that this would be a compelling product for the average email user? I'm having a hard time figuring out if you're trolling.