I'm not sure this doesn't sound to strong.

I think we are not at the stage of scipy, where Ralf enforces immediate deprecation requirement for any new code.

I had added this before
```
New models that have just been
 -included might require adjustments as we gain more experience and obtain
 -feedback by users. As we expand the range of models, we keep improving the
 -framework for different estimators and statistical tests, so further changes
 -will be necessary.
```

???