Good idea to promote people makeing bots that actually help users... this however might be useful for bot developers that actually want to help the community.
The only problem I see is that most bots are made with the idea to make profit for their authors by upvoting content or doing somethign else, so may of these probably would not want to introduce their bots let alone make them do something only if invoked by a user.
that is why it is important for the community to upvote the bot's useful responses. If the bot writer's can make more money from making useful responses, they will do that instead of spamming.
Basically instead of a neverending war (like virus vs antivirus), steemit humans can reward good behaving bots and thus incentivize the whitebots. As soon as the bot writers see there is more money making whitebots than blackbots, instead of an unwinnable war we end up with proliferation of useful bots. At least that's the theory...
of course there will always be spam bots that nobody likes, but by having a clear path to profits for botwriters, it can only reduce the spam bots