Support for a new figure depends only on one thing : The figure.

Any "New" figure has to bring something "NEW" or something UNIQUE".

Something, anything, NO other figure has. What does it offer to the users that NO other figure offers?

Or ?? Fill a hole in the market?
The popularity of a new figure depends on demand. Where is the demand?
What is lacking in the current figures, creating this demand?

2 area's money can be made:

1; "REAL" men and women with lots of build in muscle detail, instead of anorexic idealistic dolls. Easily done within 20K Poly objects.
Include a "real" texture and a good displacement map.

2; Lower Poly figures for animators, around 12-15K Poly's max.

Last but not least.
Build the support yourself.

One VERY good launch was  "Little One".
The creator made the figure, and made LOTS of freebies available within days and weeks of release.
He was ready. He was prepared. He had his priorities in order.
Users like - apreciate that. I bought Little One., and I NEVER buy. I think that says it all. It was the figure, poly count, support and freebies that triggered the buy.
I respect a guy that knows his stuff.

Before you launch a "NEW" figure?
Have a complete "free" clothing, shoe, and hair set in hand to populate the freebies sections. Let people know a new figure is out. Get people interested. Be sure that forums "talk" about your figure.
And last but not least ; keep the momentum going.

Once a figuer is "known" for its quality and support, the rest will follow automatically.
The more people get involved, the more support will come.
As soon as vendors see a certain figure getting used a lot, they will start building for that figure.
The more add-ons that come on the market, "to buy" and as freebies, the better the figure and its "add-ons" will sell.

Just my 2 cents.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!