Casey 1988
Shun the frumious Bandersnatch!
I say make your discs work for you, not the other way around. If you feel like your putting putter is not cutting the mustard any more because it's too beat up, get one that does, or switch molds, whatever. No need to be sentimental about it.
That being said, if you emulate numerous pros and take the advice of many by not throwing your putting putters, you will likely find that they only get better over the course of tens or hundreds of rounds. I guess if you already putt with an understable, glidey putter, you may find that they could get worse in the wind, but in that case I would keep your old one around for jump putts and cycle in a freshie.
Yes I learned this in 2007 when Then Innova Player Ken Tank Franks was playing in the South Dakota State tournament. He had a different disc a Champion Rhyno for his driving putter and then I forget what his Putter was I think an old soft Ryhno or the DX Ryhno left in his car for a while and he softened his disc to the Soft Ryhno but in sharpie carefully writing the soft as if it were a soft on the disc anyhow. He wished at the time that Innova had a disc like the Rhyno in stability but without the thumbtrack in the durable plastics. He also wished the impossible a more neutral flight of the Rhyno with similar shape maybe a normal bead instead of the bigger bead the Rhyno has is all he would Allow to change.
At one point I had only one disc a putter and that was bad. The putter never changed as much as it should as Rubber Putters are different with the way they absorb impact on objects.