Can't another person be the CEO of Tron foundation? Another person that have been working with Tron foundation and knows the in and out can perform this role as well. Tron users have nothing to worry about.
USDT's company is Tether, not Tron lol. Besides them being partners(as far as I know) Tether just integrated their stablecoin on the Tron blockchain, like how they also have USDT on Ethereum, Solana, Avalanche, etc. Tether doesn't need Tron necessarily.
But yea, RIP Tron. (as if it wasn't pretty much dead to start with)
Over 40 to 60 percent of USDT are in Tron blockchain. Fast verification and low transaction fee. Life made easier with USDT TRC20.