It's pretty clear that a lot of us would love to see more plastic mechs. There's a another thread asking about it seemingly ever other day. We also know there's a number of reasons why Catalyst can't produce them to the level we'd all love to see.
But what about IWM? Yeah they only deal in metal minis, but so did reaper for a long time. Not to mention Privateer press, Wyrd, and many other companies. They've already got the experience with minis, the phone number of a lot of talented sculptors, and most importantly, the rights to make battletech minis.
Who knows, if it worked out maybe they could even change their name to Resin Zephyr Plastics!