I like 27" wheels. I don't have that pathological NEED to go to 700c.

If you're building new wheels and it's not causing a brake issue- I see no reason to stay at 27"

All of my 27" bikes are still 27s. I moved one bike TO 27" to suit a particular set of brakes.

I keep playing with the idea for my old tourers- but these all have narrowly spaced canti posts- so the 27s fit the brakes better. I'd LOVE to maybe have more room for fenders... but I've put some money into getting decent wheels for all these bikes. Super Champion and Wolber 27" rims with Avocet/Phil Wood/Suntour hubs... way, way way cool.