take some time to read over some of the changes to the tournament structure posted on the site. SJC's are supposedly getting a big buff (to be announced) and we have events like jonin's back now.
Chunnin prizing was incrased and SCJ prizing is to be increased. we even have an in between event with good prizing as well.
as far as your opinion on block? well that's just kinda the way it is. I think Naruto but benefit a bit with an "extended" format like magic. But rotation is a system that works for other ccg's very well and it's working for naruto very well too.
I'd say yes, now is a good time to get into the game again. the variety in the meta is amazing ( just went to a chunnin where 7 different decks topped) and the prizing is better (winner got a full set of 25 and 100ish dollars worth of promo's)
In the end it's up to you I just recommend you read up on the changes and increased and decide for yourself if it's worth coming back to naruto.