I don't have a problem with heroes changing names.  When Vance Astrovic ditched Marvel Boy in favour of Justice, it made sense... and had a better ring to it. 
 
However, I hate it when they pick one that's already been used.   I understand that Gotham needs a Batman, but what's Dick going to go by when Bruce inevtiably returns?  It's unlikely he'll take the step back into Nightwing.  Bart Allen was GREAT as the Impulse.  I hate the fact that some editorial decision was made to turn him into Kid Flash... the Impulse identity was his & his alone & avoided any pointless confusion.  Although I do like how Theresa Cassidy is now going by Banshee in honour of her father, it can still be confusing & sure does seem to be the topic of debate.
 
On the other hand, at least they do pick a name.  Unlike Jean Grey in the 1990's.  The post X-Factor era where she ditched Marvel Girl (again) but didn't want to be identified with the Phoenix.  Was it SO hard to think up a new name for her?! 
 
But I think we have something similar here.  Members can ditch accounts & create new identities for themselves.  We have these internet identities with which we can either hide our true selves, or condense & concentrate our personalities.  But these names & avatars are how people identify us...    

"

I changed my name in real life... It's just hard to make friends when your name is Evil von Hitler....

"

I'm not happy with Siryn changing her name too Banshee  !!!!!!!!
 and Jean Grey should have a codename, Marvel Girl was OK, but I didn't like it too much. Phoenix is just a references to how over-powered and terrible she was.

Unless it's like a transition from Robin to Nightwing (What Dick Grayson did) I think it's OK.

Bart should still be name Impulse, there was no reason to turn him into Kid Flash.

I like changes, and evolutions in my characters^^
 
But I gotta admit...
Doctor Pym...
ROCKED! XD

Honestly, I think "Ant-Man" would had still worked when he started to become a giant. I am reminded of the 1950's movie "Them!" where a giant mutated ants attacks humanity.

actually dick grayson changed his name because he wanted to be his own man and while he is robin he can't be his own man people will think of him as batman side kick thats why he became nightwing. he became batman because tim didn't want to do it and bruce was lost in time and the world need a batman.