So true, Zoid.
While waste is never a good thing - for our wallets or our planet - most of our hardware really wasn't made to last forever. (Doh, what is??) So some things, when they break, wear out, or otherwise reach the end of their useful life are best consigned to the spare parts bin, and replaced with new.
Of course, some things can benefit from creative restoration... and at the price of Protanks, I can see where some would want to try that route.
As long as the glue is kept away from the inside of the glass, it shouldn't be an issue, imo.