Hi Killah,
yes, Lehmacher designed the Tecball. Both the P4P and, increasingly, the Tecball, can be found in a lot of places in Germany. From what I've heard, they play very similar (I haven't played the Tecball yet. I'm only a rookie with very little experience).
The P4P is still the dominating table for two reasons:
Firstly, it is the modern version of the Löwen table, which is still the standard table in most bars. Now, when a bar owner has to replace his old table, he is very likely to do so by choosing a P4P as a replacement. Lehmacher's most relevant competitor is Leonhard, whose tables are indistinguishable from the Lehmachers by a layman (except for the colors). Leonhard also used to build the old Löwen tables for most of the time.
Secondly, the P4P Tour is THE foosball tour in Europe. For example, Billy and Rico play on that tour, as well as the best German and Swiss players. So whoever wants to practice his skills with the biggest tour in mind will buy a P4P for his basement.
Future developments are hard to anticipate. One would have to take into account where the game is going in general, which new tables have a chance to prevail in the market, what the ITSF and P4P will be doing in the future, etc. If I had to guess, I'd say that the Lehmacher P4P will continue to be the dominant table for at least another 5 or 10 years. But who knows? The Fireball, for example, seems to be on the rise at the moment. If the manufacturers will be able to get their table into a well paid tour, it could break Lehmacher's dominance very quickly, since the official tournament table can be purchased for less than half of the price of a P4P. We'll have to wait and see...