To early in it's own lifetime to tell if it's in the "best consoles of all time" league.
Having said that, it already has an amazing software line-up, has amazing games coming up in the near future and it can only do better from there, so it very well be a contender for that title once it's all said and done with the console.
Personally, I love my 3DS. It's currently my most played device, surpassing even PC (which is something that very few consoles have done in recent years) and I don't see it slowing down.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
