Like some people already stated it won't change much.
You actually already need a good amount of matches to reach level 30 (unless you permanently use boosters and play at events only).
Even if you increase the max level to 50 or make it more difficult to reach level 30, you will have the same or similar issues eventually.
If 300 matches aren't enough for people to play decently, even 500 matches won't do much for them.