There are a lot of issues here. For starters, jump-cue sales influencing rules and rules influencing jump-cue sales are kind of "chicken & egg". It doesn't matter at this point. Yes, there is little doubt that tours have been more open-minded of late because jump-cue companies do support these tournaments. Also, jump-cue sales are always on the rise because they're allowed and the technology is always getting better. However, that's not the issue at hand.
The issue is reviewing the jump-cue rule itself and wondering if its existence is consistent with the traditional rules of pool. My problem is where the rule is placed. Is it a game-specific rule or is it a general rule? This is important because should any one game have equipment rules? If so, how might such a distinction influence other games? If the rule should be listed as a "general rule" of pocket-billiards, how would it impact the other games such as 1-pocket or straight pool?
If jump-cues ARE allowed in straight pool, we have to consider how sacred our records are (ie., Mosconi's 526 consecutive balls pocketed). Now, I know many will argue that there have always been equipment changes and some of these changes have made the game harder and easier, impacting the value of these records. However, I think most will agree that the jump-cue has overwhelming impact, probably moreso than any other equipment change since chalk was introduced.
It's unfortunate that we are still arguing about the legitimacy of such a product and even more unfortuante that we found ourselves in such a state virtually by accident. Local and Regional tours will refer to the BCA Rules for a degree of uniformity, clarity and simplicity but will quickly add/subtract to those rules whenever convenience dictates they should. Because of this, jump-cue sales were allowed to penetrate the market and have taken on the momentum of a runaway train that is nearly impossible to slow down or stop.
You can't have different sets of rules for players that choose to use a jump cue and players that choose not to. Rules always need to be consistent. However, I do feel it is important to allow a degree of protection. Limitation of jump-cue use would be an interesting way to go but how many scenarios would need to be considered? Rigid jump-cue specifications would also be interesting but how do you enforce such rules? It would be nice if only equipment that has received BCA-Certification were allowed in use. At this point, ANYTHING is allowed to be used at the table unless specifically banned and really, it should be the other way around. Everything should be banned unless it is specifically stated that it is not.