One, what benefit does the B1G have by adding WVU, or TCU?
Two, this is not about TV markets any longer. Literally, there's no such thing as a TV market when you can stream a game in Georgia while living in California.
Three, WVU and TCU are not members of the AAU: a staple in membership of the B1G.
Four, TCU can't join the B1G because it doesn't border a state with a B1G school (another requirement in their bylaws.) WVU can, but they don't fit the academic requirements. This also applies to Oklahoma State: they don't border a B1G school.
IF any of this were to happen it would require the B1G changing their conference membership requirements. When has the B1G done anything with other conferences in mind (other than hoping all would follow their C-19 goals of canceling the season?)
FWIW, I believe the B1G HAS to make a move here by adding more brands. If they don't recruits will flock to the SEC in a greater degree than they are already: competition against the best in the nation.