Every now and then one of the gun makers will trot out a maple-stocked rifle model, and they often are quite attractive. I have seen both the Winchester M70 with maple stock and the X-Bolt with maple stock, both are quite attractive. Unfortunately, maple stocks come and go, some people love them and some hate them. They are not the traditional look so they won't do for many people, and so they get looked at but not bought. I say if you like it, buy it.
Maple is a bit denser than walnut, and can be very hard, but I have not noticed much of a weight difference when a rifle stock is properly proportioned. Biggest difference and reason why walnut was the traditional wood is that it is a commercially grown wood and the supply is very good, we grow walnut trees for nuts and harvest the trees at about 50 years. Although maple is also grown commercially in some areas for maple syrup harvest, most maple lumber is wild-grown and therefore supply is limited.
Blond woods make the occasional appearance and then fade away again. My Mauser in 7X57 is stocked in figured myrtlewood. Beautiful, but a pain to do the stock work. Just a little bit of stain to make the grain stand out and a blond stock can be a real beauty.