Well, of course re-releases are used to pad release schedules. "Hey, we don't have any new games but here's an old game with perhaps a new mission tacked on."
Hence, Assassin's Creed: The Ezio Collection, BioShock: The Collection, Borderlands: The Handsome Collection, Call of Duty: Modern Warfare Remastered, Dark Souls II: Scholar of the First Sin, Darksiders II: Deathinitive Edition, Darksiders: Warmastered Edition, Dead Island: Definitive Collection, Dishonored: Definitive Edition, DmC: Devil May Cry Definitive Edition, God of War III Remastered, Grand Theft Auto V, Halo: The Master Chief Collection, Heavy Rain & Beyond: Two Souls Collection, Injustice: Gods Among Us - Ultimate Edition, The Last of Us Remastered, LEGO Harry Potter Collection, Metro Redux, Saints Row IV: Re-elected, Sleeping Dogs: Definitive Edition, Skyrim Special Edition, The Witch and the Hundred Knight: Revival Edition, Tomb Raider: Definitive Edition, Uncharted: The Nathan Drake Collection, Valkyria Chronicles Remastered, and now I'm bored, so this much of a list will have to suffice.
Of course, this being Nintendo, unlike most of the games mentioned above, we can fully expect them to release at full "new game" MSRP, then stay there forever.
If re-releasing games lots of people generally liked and lots of people generally played is considered a lazy cash grab (because it is), then re-releasing games lots of people generally liked but few people generally played is...still a lazy cash grab. We can agree to not use the phrase "lazy cash grab" but that doesn't mean it isn't. :D
They're both really solid foundations and I'm not sure we really actually need brand new iterations at so soon.
You know why you just said that? Three horrible letters...DLC.
IF Nintendo hadn't been so greedy the first time and just SOLD TWO COMPLETE GAMES, people would be super-excited to see what new MK and new SSB games would be like on a brand new system.
MKW came out April '08, MK7 came out in Dec '11. MK8 partially came out May '14, and they finally bothered to finish it April '15. Being about 3 years between releases, we should've been due for another in '17 but as you say, it feels too soon.
Oh, well, Nintendo can have the last laugh by re-releasing the games again and charging full price again.