The whole thing comes down to what Topps feels the value of the IP is.
They can support,sell,licence, or shelf the IP at any time based on what would be of the highest value to them.
They have already shelved a IP do to it not being worth selling and not making as a licence before. (renegade legions)
So if Shadowrun is not profitable to Topps it could face the same fate, if no one wants it or if their management team feels that they can't make a profit from support,sales,or licencing.
In that case it would not matter who wants it.