Use it to your advantage... see if the wheel base changes help the car out at all...
That said, ok I only race sedan electric 1/10th with a tamiya ta05 (never wheeled or wrenched a nitro car of any description) and some cars seem to work better or have no change the them with wear to the arms.
I think to some degree, Tamiya cars (and these may not be the only ones) do not suffer from poor handling when arms and other suspension parts wear, I havn't noticed it on mine and its 2 seasons old