Ah, interesting changes. 
Not sure if that improves the situation a lot, because I'm usually pretty good at skipping signatures anyway.
But if someone is annoyed because of adverts it won't really be less annoying. People that hate them turn them off. People that are interested in unpaid signatures and are usually reading them will still see/read all the adverts.
The main problem for me are the many spammers that make pointless comments everywhere just to get their post-count up. Don't think that will improve much. It's not only Newbies that spam.
Not sure if that improves the situation a lot, because I'm usually pretty good at skipping signatures anyway. But if someone is annoyed because of adverts it won't really be less annoying. People that hate them turn them off. People that are interested in unpaid signatures and are usually reading them will still see/read all the adverts.
The main problem for me are the many spammers that make pointless comments everywhere just to get their post-count up. Don't think that will improve much. It's not only Newbies that spam.
The reason it has my full support is that I see a change in the way advertising will be handled under this model
When the forum switched from showing posts to activity, signature campaigns also switched their programs to be based on activities and posts
In this scenario it is possible that there will be adjusted tiers based on activity, posts and now visibility
Meaning that their is an incentive to reward users differently based on their duration here which may help to reduce spam.
At minimum there will be significantly less users complaining about bright signature ads because newer users will have less visible ads than older ones, and increase overall readability of the forum, it also will likely increase quality of posts as those big ads become more visible they will have had more experience here and reduce low quality posts as Theymos pointed out.
Furthermore its not like the signature providers don't also filter try to filter out users who spam with their ad so it helps in that regard as well.
In theory we may see some model changes as advertisers adjust their models due to the new visibility change.
Something like this one for example
Junior- Sorry you do not qualify
Members will receive .0065 BTC/week
Full members will receive .0070 BTC/week
Senior members will receive .0090 BTC/week
Hero members will receive .03 BTC/week
Or to bring back tradefortresses model something based on activity post count and visibility (not just including present posts but the historical ones accumulated over time) and higher tiers not being allowed to get the higher return until their activity reaches a certain point
https://bitcointalk.org/index.php?topic=198934.0