I love seeing people jump ship before even touching the game. Young Link looks cool though so I will probably lab for him as well as Link and Zelda.
I'm not saying the
final version will be nonviable but Link
as he is in the demo is a bad character.
Link loses CQC to most of the cast so he needs to zone them. BotLink can't detonate bombs near him because the large explosion hits him too, UNLIKE IN SSB4. He's lost one of the best combo starters and zoning moves in any smash game: normal bombs. This is a huge nerf. Remote bombs only operate as a long range nuke attack and suck as C4s because the opponent can pick them up with no risk. They can't combo into attacks nearly as well because Link must pause to detonate them. The lack of a timer means he gets ledge trapped because he can't time a ledge getup or roll to be covered by the explosion. They don't work in CQC without hurting Link too.
Like I said, Link loses CQC to most of the cast. Partially because he doesn't have good angles on his attacks. Compare his sword attacks to Marth's; Link either swings along horizontal z axis lines, Fair, or stabs his sword out, Uair. Marth has nice vertical crescent slashes that don't have dead zones. How Link dealt with this was by mid-range zoning through bombs, Zair and pivots including pivot grab. Now his mid range game lost Zair, which beat Marth's sword range, and bombs 2 of the best zoning moves in the game. With the exception of boomerang Link is no longer a zoner. Unless he gets frame data buffs for sword attacks he'll be terrible.
If opponents can pick up arrows too it means wiffed arrows give characters like Ganon an item to toss at him. So if anything this is a nerf.
Boomerang at least is a strait buff.
Link's grab is a mixed blessing, assuming it's not stupidly slow like Zelda/Greninja's ssb4 grabs. Link actually has a low commitment CQC option to beat shields now. That's great for tomahawking, platform pressure (think SV), and getting critters out of his face. The downside is he loses a mid-range punish option that outranges things like Marcina's sword. Pivot grab was good in ssb4.
Losing Zair, a safe poke the size of Shulk's Bair, really sucks. Link is now much easier to dash>shield grab by characters like DK. He has no aerial mid range answer to bigger swords like Cloud's.
This also makes recoveries more linear, although moving airdodges help everyone, and he can't stall 2 frames like Ike's eruption. Link can't escape by FF airdodging offstage>tethering the ledge. This with losing bombs to cover landings seriously nerfs his landing disadvantage state.
So
in the demo, Link is nonviable. He could gets frame data buffs and OP options like ding dong and still be viable in the final game, patches exist. He just won't be a zoner like before.