I think fans would be more pleased if they'd just released it in the west at some time in the last eleven years. :P As GBA VC already exists, it appears Nintendo is intentionally withholding it to reveal it as a BIG SURPRISE. I will be proven 2000% right if they decide that ONLY Switch™ VC will be good enough to run this eleven year old game.
Now that you mention it, you reminded me that when Earthbound came out on Wii U VC, Nintendo decided to be jerks and charge an extra $2 (a 25% increase) just because. Or when Earthbound Beginnings came out costing an extra $2 (+ 40%).
GBA game rentals on Wii U eShop are priced at $6.99 for regular titles and $7.99 for games they think they can squeeze customers a little harder. I will be totally unsurprised if Mother 3 comes out at $8.99 (+29%).
The jury is still out about the whole Super Mario All Stars pricing thing or Wii to Wii U VC "convenience charge" (that also ignores your save data). I mean, there are just certain things that make companies look insatiably greedy and well, I've seen people in the comments sections grousing.