That's not the case. We don't know If this is going to be the last fork or not but something for sure, the supply will remain the same.

Will this be last fork or will have 21 mil coins every 5 years?

Attackers attack the email to get the 2fa out of the way.  Point is that I daily get a half dozen emails that one account or another has a password reset attemtpt.  I keep everything tight as a button, so there is no worry, just sheer amazment that it is almost always a Bitcoin related account and even though I just said that I have a huge number of accounts, in comparison to all the other accounts, bank accounts, emails and such, it is staggering how much people try to hit those crypto accounts.