tires do wear, and you may want to try skinnier ones with the same type of non-knobby tread. a set of 1.25's would probably lighten the bike up a little and be fine as long as you stay on pavement.
just stay safe, and don't buy anything but tools, cleaning supply, and lube for the next year. you'll be proud of yourself and able to treat yourself to the exact bike you want after that long.