Any screeching sound from the serpentine belt is a sure sign of potential failure and should be addressed immediately and not ignored for 10,000+ miles.
Setting rant aside: 1. 50k miles is as long as a serp belt should be run before replacing 2. any bearing noise that's loud enough to easily hear when the bearing is spun by hand is likely a sign of a bad bearing. 3. any bearing wobble is a sure sign of a bad bearing. 4. alternator pulley is an OAD pulley. It should spin backwards and spin with a spring feeling forwards IIRC. If it spins freely if both directions it's likely shot.
Given that you ran the screeching belt that long and that the belt failed I'd recommend at minimum you replace a) belt obviously; b) both idler pulleys; c) the tensioner (it has been bouncing for 10k+ miles probably; and d) the alternator pulley.
More rant; bad sounds = bad things and ignoring bad things get's progressively more expensive.
_________________ Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs
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