Making it harder for smurfs to rank up accounts - good.
But don't stop there!
Man up and actually ban smurfing!
For too long Riot has allowed smurfing to remain within the rules even if they don't like it.
It seems like there are three things keeping Riot from banning smurfing:
1: There exists one legitimate reason for smurfing, and that is to maintain separate statistics for your offrole/offbuild/offmeta games.
2: High profile streamers do it, and they can't afford to lose the free advertising that they bring by banning them.
3: Detecting and banning smurfs is hard and once there's a rule against it we're obligated to try.
The solution to #1 and #2 is to create an alternate profiles system where an account can have multiple profiles that all share punishment status, but not MMR or stats. The streamers and pros can use this, and the losers who want to evade the punishment system can't.
The solution to #3 is to grow a pair as a company. Yes it means investing man-hours and therefore money.
BUT it will also ensure League stays the dominant player in the MOBA space by improving matchmaking and the level of toxicity in the community.