I hate to bring it up, but with the recent hardware exploit and subsequent hack of the Switch, Nintendo is on a short leash when it comes to bringing a service people want to pay for. The alternative is already pretty appealing.
Furthermore, Nintendo is already in a bind regarding their Nindie developers. The lack of ports and old classics has given developers an exciting environment to develop for. The switch is already one of the best places to sell low-budget games and the lack of competition from Nintendo is one of the main reasons. If they unleash a tsunami of VC games, developers may pull support for more fertile grounds.
So to recap, Nintendo is in a tough spot between supporting developers and supporting gamers.