Updating, re-designing etc. all costs money. People buying a Wave are not willing to spend/pay more, so I would assume that LM leaves the Wave as it is.
I however foresee that either the Charge (already a much more expensive tool than the Wave) gets updated or IMHO more likely that the Signal gets a brother with 4 outside tools.
Why the unloved Signal?
- It offers a hammer, distinguishing it from all the competitors tools
- The Signal frame has more room for tools than the Wave, as you can have tools in the outer-long-tool layer