I guess I'll just talk about a one point you made because there is no way I am going to talk about everything in that massive OP:
"Moreover, Nintendo has promoted low competitive environments, where shovelware could thrive and sell millions on the Wii. A console with less than 40% of market share was able to collect many more (and far more successful) trash games than PS1 with 70% or PS2 with 75%."
The reason there was so much shovelware on the Wii was twofold:
1. Relatively cheap development costs: Due to the weaker hardware of the Wii, the development costs and development times could be drastically decreased, allowing the creation of games for much lower costs.
2. Extremely large "casual" userbase: More casuals means more people who are likely to buy a bad "shovelware" game.
I totally agree with you on this and the OP doesn't say anything against it either.
(EDIT: I would like to add that neither of these things are inherently bad. In fact it could be argued that these things are inherently good for the industry, despite the side effect of increased shovelware)
Now, you also say this implying that this is bad for the industry but I disagree. Lets take WayForward Industries as an example of this. You may know them as the creators of games such as "Shantae" or the Mighty franchise but did you know that they have also made games such as "Despicable Me: Minion Mayhem" and "Space Chimp"? Yup, a fan favorite developer funds its wonderful projects by pumping out what many people would refer to as shovelware.
Shovelware by nature is a cheap way to make a profit and in these times of "one unsuccessful game and you go out of business", I don't see how you can complain about that. Where M$ and Sony provide a space in the market that breeds extremely high dev costs and multimillion dollar projects that could very well bankrupt a company, Nintendo has provided a space that allows significant creative freedom (due to innovative control schemes) as well as lower development costs (due to weaker hardware).
Shovelware isn't evil by nature, in fact, it may be the reason some of the games you love are being developed and published.
You've made a very good point and I can't say you're wrong. Yet, I disagree with you.
In my opinion, a shovelware environment (like the one generated around the Wii) is a bad thing because it concentrates incompetence at making titles and contempt for the gamer. This is everything we don't want to be successful because the moment AAA devs realize they can do more money with shovelware than with AAA titles, we're f***ed. On the other hand, PS2 was a platform for everthing (good and bad games from all genres) and nobody thinks about shovelware when thinking about the console, although it was there. This passes a very different message to developers (shovelware is the easy way but not a long-term viable option) and gamers (there is shovelware, but there is much more than that, you can find plenty of good games).
Microsoft and Sony don't make any developer to spend millions. Look at the PS4 for example, it's full of indie titles. However, they do offer the possibility for devs to create AAA titles. And that's not a bad thing at all.
Prediction made in 14/01/2014 for 31/12/2020: PS4: 100M XOne: 70M WiiU: 25M
Prediction made in 01/04/2016 for 31/12/2020: PS4: 100M XOne: 50M WiiU: 18M
Prediction made in 15/04/2017 for 31/12/2020: PS4: 90M XOne: 40M WiiU: 15M Switch: 20M
Prediction made in 24/03/2018 for 31/12/2020: PS4: 110M XOne: 50M WiiU: 14M Switch: 65M