The certificate isn't going away anytime soon, but it will likely shrink over the coming years until it is shut down some day. Likely when the E145s are retired.

There is definitely no reason to introduce new types to the CHQ certificate when we have other certs that operate those types. Shuttle and Republic's certificates being merged is more likely than CHQ getting new types. Multiple certificates only increases the company's training costs when people upgrade or get displaced. It was necessary at one point in time, but it is the company's intent to reduce the number of certificates.