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The throwout bearing is about all that can make the noise you describe while pushing in the clutch. If it siezes (binds up) it will just rub on the pressure plate causing the two to possibly weld together, or at the very least overheat the pressure plate springs. In short nothing good.
How long will it last? Impossible question to answer, remember Murphy is a bastard and will guarantee total failure featuring massive expense at the most inconvenient time.
While you have it apart replace the throw out bearing, pressure plate, disk and have the flywheel turned. I'd recommend new bolts when you reinstall the flywheel to the crankshaft. I'm using a stock (Toyota) pressure plate and disk for the 89 with my Black Top and haven't had any issues with it.
In my opinion of the parts I won't compromise quality on these are at the top of the list. I don't like pulling the engine enough to try and save a couple of dollars getting clutch parts from discount parts houses.
Good Luck!
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