The ARC recommendations would severely limit our hobby as we know it. No turbines, period. Hard 400' limit would eliminate pretty much all pattern flying. 100mph speed limit would make 80% of the models out there illegal. Hard and fast 55lb weight limit would affect a lot more modelers than just the 55 on the AMA list. Not to mention banning all RC flight within 5 miles of any airport rather than the current notify the tower if flying within three - it would in effect make another 3 million square miles banned for RC flight.

In essence you're talking about eliminating a good portion of what we are currently able to do. The impact on our hobby would be significant, but the impact on the model aviation industry would be catastrophic. By including model aviation (in all its forms, not just RC) in its sUAS regulations the FAA is trying to regulate a problem that simply does not exist. That is why the push for the amendment and the current letter writing campaign. We want our hobby to survive in a recognizable form, not be destroyed so that the FAA can put us in a convenient pigeon hole definition.