The tech used in these has changed very, very quickly. The main driver is smartphones and the research going into it. What's new one year, becomes outdated quickly and the price drops.
In addition, WiFi and BT have new standards that'll outdate yesterdays devices. Some of these might be implemented already.
GoPro took the lead and now Sony, JVC and many others have jumped in.
Point: If you wait, you'll get more bang for your buck or be given options not seen yet. The GoPro got fame but the complete package wasn't so great. but it worked. Things like remote control, battery life, storage, remote screen, etc... will all improve.
I bought a pocket HD camera years ago, it works great, but the remote sucks. It won't stay in standby mode even with A/C power, low light really sucks, and several other things that are probably standard now.
Having said that, it the specs vs price are good for you, then fine. No need to "wait till next year" just to save $50 or get the better one at the same price.
Much like buying a PC, I wait for a certain level of advancement, then usually buy what will last me for years. I then don't upgrade until I really need to.