Banks govermemts need to put alot money in btc and eth
This way there is not so much money so no inflation.
Seriously, majority of the government wouldn't do that. Instead they'll make their own digital money.
Though there were some local government units like Miami has showed interest with Bitcoin and their mayor wants to allocate some investment budget to Bitcoin but it's not to avoid the inflation, but for their city's Innovative progress.
This idea ain't easy to execute, and won't probably happen.