What are your objectives? If it's to allow more guilds a chance to win the conquest events, this will fail. You will only get a change of guilds at the top.
If it is to encourage more people to take part in the event, again this will fail. Smaller guilds and guilds whose members do not enjoy PvP will simply drop the competition. Those who enjoy PvE and rp don't want to spend all their time doing PvP even if they do tolerate it.
If you want more Guilds to take part in the event and more players to try arenas such as GSF and PvP, you must make the effort rewarding and make the rewards obtainable for Guilds of many makes and shapes. One reward is inherent in the event already: it's something you do with your Guild and for your Guild. Warm fuzzies all around. But we need more than that.
The one reward that respondents here have mentioned going to any lengths to get are the encryptions. As their value is in opening up more Guild ship and stronghold areas, making them available to more Guilds will not decrease that value. Why tie them to the top ten list? Make them a reward for reaching the personal conquest aim. After all, those of us in Guilds that can make the top 10 list get them for for just doing that! There is no need to deny small Guilds a decent ship and stronghold!
Not to mention a reason to take part in Conquest.
I agree that crafting has taken over conquest, but the cap you've put on it just swings the balance in the opposite direction. If you wish to keep the crafters and get them to expand their horizons, I suggest raising that cap significantly. If such things were monitored on a per alt basis, I'd put the cap at 15,000 points. This would put crafters in a position in which they would be quite likely to try to meet their personal target by other means. Even if they chose not to, it would be a contribution they could make to the Guild total. It would also be a low enough total that non-crafters could easily match that by their preferred methods. 2,000 per legacy is a ridiculous number. You might as well do away with it altogether.
But crafting is as much part of game play as any other activity. Those mats or the credits to buy them take skill and strategy to obtain. If it were just a matter of buying mats on the GTN and crafting in your sleep, everyone would be amassing conquest points that way. And, yes, building weapons, med kits, and so on is an integral part of real life warfare, too. Indeed, it may well be the most important part.
What about incentives for making the top ten? Hey, we are a highly competitive species. That is its own reward!
To get optimum participation, those personal conquest objectives should be your focus! There can be only ten in the top ten, after all. And, yes, they will be the largest Guilds.