A month or so ago, many of the YYZ-EWR flights had E75/90 replaced by smaller CRJ700. No huge deal, except smaller overhead bins that don't take larger sized (but legal) carry on suitcases. This morning I arrived at T1 to hear my seat had been changed from J class to Y. The reason - equipment change to a turboprop. Combined with less frequent service, and closing of the EWR lounge, service is really being degraded on this route.