I plan to just do raid passes only for the rare level 4 mons (Snorlax, Lapras, T-rex). Don't need the evolved starters personally. Probably eventually do it with level 3s just to try/test my team.
I've done 9 raids so far and plan to pretty much ignore Level 1-3s moving forward after the initial hype/interest...
Dust does go up slowly now without the 5k I'd normally get, but at least now, you don't have to invest in any defender so you save a lot there as well...it's just since this is the new meta (attacking), people are burning dust quickly at the moment, but once it stabilizes, you'll start stocking up again, albeit at a slower pace.
Also, I think for tier 4 raids, you need 6 great mons, but you can get by with 4 I think since you'll time out anyways most of the time if you have a half decent group...Most of the time, it's not as borderline.
Like you say, a lot of us who want to make the game more strategic are now looking to solo all level 3 raids so that gives us something to do...2 people in a level 3 is easy so soloing all level 3s is probably our "end game" for now.
This is why it's always good to save some dust since you can still play efficiently no matter what changed...
I've only powered up a few more Machamps after getting a TM and took most of them to level 30 so I now have 4 on my attack team.