I've been thinking about this the last few days and I really don't think it will end up being a Hank vs Walt scenario. I honestly believe this whole "retirement" theme won't play out well with his new partners, up to the point that Hank gets murdered in the process (and maybe someone else who is close to walt).
No way Walt purchases firepower like that to deal with the DEA.
The theme, similar to Sopranos, criminals either end up in jail or dead. No difference with Walt.