No, if those neighbors are not active, and their levels haven't changed, kingdom seems the same, they never visit, royal points haven't changed in over a month, I edit those neighbors. I only want fun neighbors.
If people want to neighbor me but have not visited me first or left a message on my wall, then I visit but do not accept as a new neighbor. I only want fun neighbors!
Sorry Maguar, got off topic here with my neighbor etiquette question.
I'll bring it back it back into topic and answer your question at the same time (I hope). Just say you posted that you'd unlocked all the new stuff and then you started getting a heap of invites as people wanted to have a look. Some people will leave you a message (eg just wanted to have a look, so jealous ) and some people don't. As most are just interested in looking you can probably delete with no hard feelings. The ones that post on your wall you can always respond to and say you're not adding at the moment. It may also be wise to put a post on your wall saying you're not accepting neighbours. So bringing it back to the example of if you'd unlocked all the cool new stuff "Thanks for visiting my kingdom. Loving the new stuff. Sorry but I'm not adding new neighbours". I offer to post on their wall to create a link if they want.