Probably worth it if we can get him in a decent trade -- esp if we can get rid of some garbage in the process. But, do we want to pay a third liner those kind of $.
As for needing a 3RW, won't Petan/Ehlers fill that role next year.
We are already paying Kane 6mil to play 3LW so that seems to be about our standard.
Seriously it depends on how productive he is. Kane - Lowry - Richards could be a helluva 3rd line and play = min to our 2nd line. If Richards could play either L or R wing or C that versatility would be extremely valuable when we have injuries. He could spend as much time on the 1st and 2nd lines as on the 3rd.
Petan is a C/LW. I don't mind switching sides with veterans but am skeptical of doing it with young players. It is just an extra burden for them to overcome. I'm almost certain that Ehlers is another year away but then, yes. There is also Burmi on the horizon for next year. OTOH if we lose Frolik, Richards could be a good replacement. He would also open up the possibility of moving Lowry to the 4th line for next year. His presence would reduce the chance of Chevy giving Slater a 'Thor contract'. A 3rd line of Kane - Richards - Burmi and a 4th of Gali/xxx - Lowry - Hali/xxx and our bottom 6 is pretty good. The xxxs could be any of O'Dell, Klingberg, Kosmo, Peluso, Lipon, FA, OK Thor.
I always think that you make the team as good as you can now. If that leads to an excess at some position later on you deal with it when it happens. That is one of those 'good to have' problems. You do have to apply some foresight but so often things just don't happen as expected that it is seldom wise to pass on something good because you have an expectation of something >= just around the corner.