The 146 will remain until the CRJ 705s are delivered, and will replace them on a one-for-one basis, and will be operated by Jazz.
Jazz, as you know, presently operates 50 seat CRJs. They will be allowed more CRJ200s, as long as Air Canada mainline gets the EMB 175s and 190s. The way the Teplitski arbitration reads, is that the 50 seat RJs can be added to the Jazz fleet, only at (roughly) the same time and rate as the arrival of the EMBs at Air Canada mainline.
But also, as you know, Air Canada is notorious for backing out of signed employee contracts. It is my opinion, (and only my opinion), the EMBs will never arrive at either Jazz or Air Canada. Once the increase in CRJs at Jazz occurs, Air Canada will "suddenly" decide against the EMBs.
Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!