There were many opponents, including myself, which who were completely against Nintendo doing mobile games of their IP's. There were many fears moving foward with this concept that harbored: 

Fear of degrading their IP ; Fear of going fully mobile ; It would detract from their main console games; Fear of mobile game policy influencing them; etc.

After the launch of Miitomo, Super Mario Run and FE: Heroes, (I don't count Pokemon GO and never will because that is not only mainly the Pokemon Company's decsion, it is also made completely by another developer), some fears for many have been alleviated and some new problems have arisen. Some people expected Nintendo to fundamentally change and improve as a company to their taste when they made content for a platform not owned by them, but that is not how it works nor did it. The quality of the games on the devices have been consistent with how it has been on consoles, just on a much smaller scale. It also is a fantastic way to advertise their games.

I don't like mobile games as a whole. but I liked Sonic Runners unironically, because it was a great way test reation time and quickly asses the situation. Since then I have been more relaxed about mobile.

I have also tried FE: Heroes, and it really is neat to have when you're waiting on a line or something. It's not nearly as fun as the real thing, but it is quality work. Like a Fire Emblen lite. Stamina is good, I really don't like microtransactions and that is my main detractions from playing ANY game that has it. But so far you would have to REALLY want to get characters to get it. Playing vanilla is fun enough. It also makes me go and say, "hey this character is cool, I haven't played this game though, let me look her/his game up."  I have yet to try Mario Run because I use Android.

Anyway what do you think so far of Nintendo's mobile efforts? Have you changed your opinion? Or perhaps you either patting yourself in the back or  groaning?

Ultimately I can say it was a great venture for them which I am still against. I perfectly understand the logical fallacy of my opinion and I accept it regardless.

If it doesn't take a lot of development time and makes them money to make real games, then its fine. I dont buy or play mobile games, so that's all I can hope for.

I was fine with them going mobile, and considering how terrible the Wii U was doing, I felt like it was inevitable for them to try it.

Miitomo was a fun distraction, but I was genuinely pleased on how decent Super Mario Run and FE Heroes are for mobile games, coming from someone who can't stand games like Candy Crush.

Seems they have officially gone mobile. Meaning that switch and 3ds are mobile devices.

Going mobile =/= Going full mobile. 

 The Switch and 3DS are consoles. Despite being able to take them anywhere with relative ease, they are not mobile devices in the same sense as smartphones.

Never go full mobile.

I'm okay with them putting out smart phone games as long as it doesn't harm their mainline offerings.

I mean them going mobile is basically advertising that they profit from at the same time, none of their mobile games are main series instalments, they're just small mini experiences designed to promote the franchise so more people buy the real thing.

As long as they don't lose focus on the game console, I'm fine with them going mobile

It's a great way for them to market their consoles, i hope they do it effectively.

They should even introduce cross hardware bundles, such as pokemon go/sun and moon.