The Big 10 is going to be tougher now. Not like the SEC but tougher than it was. The days of them playing two teams with a pulse each year are coming to a close.
I've been thinking on this for a bit. While you're right, the B10 will be tougher than they used to be, they'll still be a two-tier conference without much of a center.
Here's how I'd chart it out (note: i'm projecting everyone, including our Vols, where I expect they'll be at the END of this season, rather than before the start):
Yes, the SEC is a bit more robust at the top, esp. once the Vols get back where we belong, I think starting this season. But the big difference is in the middle.
Acknowledging that Florida is a hot mess right now and kinda doesn't count for much, still normally the SEC has a good 5 or 6 teams in a pretty decent mid-range. The B10, even with the addition of USCw and Washington, is anemic there.
Meanwhile, look at the (effective) schedule padders down at the bottom of the B10. Every once in a while, Wisconsin or UCLA may remember past glory and pop up into the middle, but usually in the last several years, they're among the bottom feeders. That's a lot of fairly easy Ws for Michigan, Ohio State, Oregon and Penn State.
So sure, the B10 is going to be tougher. Than they were. But the few teams at the top are still going to have a significantly easier road to 10+ regular season wins than anyone in the SEC.
Go Vols!