When the bearing fails it will cause your crank to fail, which will cause the top end to fail. Can work out quite expensive in the long run if ignored. Will end up having to replace bearing, crank, rebore, new piston.
You'll need a flywheel puller and clutch tool, Also bearings pressed out and in. Add new gaskets, seals etc. Not exactly a new engine but not a small job either. The longer you leave it the more chance of those parts seizing up and causing damage to others
