I think wireless has a bright future. One, I think has been lacking. However, I see the future being better suited to satellite speakers, like for my patio, or surround speakers than for mains. In fact, I was rather dismayed at the lack of options looking for wireless, or semi - the speakers wired together - for my patio. Options were pretty much nonexistent for a house wide system.
The issue I have with wireless mains is, are you getting a better amp/speaker combo per $ spent than with separates? Also, finding three (one for each speaker plus the hub) more outlets around your main system (HT) is as much work as running some wire from an amp. Upgrading can be more expensive. Moreover, what about if one of the amps goes out? I can survive a while if one surround goes out.