Now with BMW's new naming strategy in full flow. I hope that any future BMW does not grow anymore in size.
If the 1 series is too small; get a 2 series.
If a 2 series is too small; get a 3 series
So on and so forth.
As BMW listens to its current owners to get an idea of what the market might like. Lets hope that wanting/needing your current car with more room inside, is met with a response of upgrading to a larger model in the series line up instead of making the current car larger.