I would love for the B10 to hold its Tournament in the Prudential Center. It's a great venue, but Newark might be a hard sell for the fans.
The key issues for the Big returning to MSG on a regular basis for its Tournament, depends on (1) whether the constituent members want to convene the Tournament in NYC, as I am sure that there will be push back from Indy and Chicago; and (2) Will MSG bump the Big East during the years that the B10 wants to return, common sense says "no", but money can sometimes move mountains.
We'll have to see the Big Ten's final assessment of this tournament at MSG before we know if the Big Ten is even interested in returning to NYC. But preliminary reports indicate that the tournament was a huge success from the Big Ten's perspective (other than holding the tournament a week early). Likewise, we'll also have to wait for MSG's assessment to see if they're interesting in having the Big Ten return.
But assuming there is interest on both sides, it wouldn't be until 2023 that the Big Ten could return, since the Big Ten is already contracted to other venues for the next 4 years. And, from MSG's perspective, it would not be until 2027 that the Big Ten could return, since MSG is contracted to the Big East through 2026.
Of course contracts can always be broken or bought out. But there is probably not enough incentive to break two contracts in the next 4 years. In 2023-2026, only one contract (between MSG and the Big East) would need to be broken. But barring a collapse of the Big East, there is not likely to be enough incentive for MSG to do that. Possibly the Big East could be enticed to trade MSG for Chicago for one year, but I don't see the Big East willing to do that, unless they see that as a pilot for post-2026.
2027 is a long way away, so who knows what will happen. Maybe the Big East wants to alternate tournaments between NY and Chicago, since half the conference is in the midwest. Maybe BET becomes less financially viable for MSG and they don't renew the contract with the Big East, or modify it so the Big East is there on a rotating basis, opening up years for the Big Ten and/or ACC. Maybe the Big Ten decides to hold their tournament at MSG every year, so MSG has a straight-up choice between the Big Ten and Big East. I certainly can't predict what the landscape will be in 2027.