When it comes to widgets less is indeed more because every followers widget contains a backlink (outbound Google juice) to the source of the widget ie. they promote and lead traffic to the site serving the widget;
1. Every followers widget contains multiple links ie. outbound Google juice to sites beyond your blog;
2. In blogs that have sidebars on every page such widgets "leak" Google juice as the sidebar loads every time any page on your blog loads;
3. Followers widgets can spoil the blog design and give the blog an amateurish appearance;
4. Followers widgets can also compromise blog speed (page loading time), in short viewers have to wait for widgets to load before they can interact with your blog. This may not seem important to bloggers on high speed broadband service but most people surfing the web today are on dial-up service;
5. Followers widgets distract readers' minds and eyes from reading the content in your blog posts on your front page of your blog.
6. Followers widgets distract readers' minds and eyes away from navigational widgets in sidebars which contain links to the deeper content in your blog.
If such a followers widget is introduced here at wordpress.com and given the recent changes I will not be surprised when this does happen, then I will not use it. This is because I do not add widget to my blog unless they:
1. improve the functionality of my site by providing reader accessibility to deeper content that is not located on the front page of my blog;
2. redirect readers to high quality sources of relevant information found in authoritative blogs in the same niche (note that this is what Links widgets do).