Shaw can't compete against the Big 3 in wireless. And they don't want to. That is why they are selling. A 4th player cannot compete. There is a strong possibility that Shaw and Rogers combine cable operations and spin out Freedom Mobile. Of course, that will be the end of Freedom Mobile as a major player. They can't afford to expand their network, forget about 5G which will cost far more than 4G by many factors.
By the way, their service sucks pretty bad, unless you happen to be in a core urban area. You get what you pay for with their cheap service - cheap coverage. Urban areas not so popular these days either in the pandemic. Maybe Shaw sees all this and it's time to get out before it bankrupts them. Sell at the top.
For everyone thinking the Federal government will save you, forget it. They collect billions and billions in licensing fees every few years. Maybe there is some alternate universe where the Feds decide to unbuckle infrastructure, but that is mostly a dream, as they have no real incentive or will to do anything.