I don’t think it’s necessary a bad thing if SNP spend some time behind Labour in Scotland. Both in Westminster & Holyrood.
They’re almost certainly going to be shown up as the austerity 2.0 party after this GE. Anyone that’s been following the pledges can see, the tax freeze commitments of both the blue & red Tories can only come with deep public service cuts.
So either they break their promises & raise taxes or they make life even more grim for people in Scotland & across the UK.
The SNP are almost certainly playing a longer game here. One or two Labour governments and if the UK is still in decline (which it almost certainly will be), no voters will have nowhere left to turn. Hopefully enough will then know what we did a decade ago.