If the frame fits you well and there's no indication of fatigue anywhere, I'd have a hard time seeing that changeover to a different frame would be necessary.
Yes, it'll require a tear-down (but then, it's probably time for that anyway). Yes, you're considering a full strip and repaint. I suppose for all of that work it'll likely be roughly the cost of a new frame. But this one's a known quantity. I'd be very tempted to keep it, prep it, then build it up with new components. Viewed from one perspective, it'd be a new custom bike built "on the cheap" but with one fewer question marks for you.