I don't really see why they should change the system. If a guild wants to rush to a secure and then is too lazy or disinterested to finish it off, so be it. They still will not get the reward for their hard spent time and stamina until it's finally done.
What should really be done is that HCS should develop a high level titan with a reward people actually want, as has been suggested by several high level players. HCS was warned about this happening by more than one player once this latest Titan was introduced. There is no sense in changing the whole system when the attractiveness and value of the latest titan Drop is the real issue.
The elemental blazing shield is the best shield (for hunting) from Level 900 until it gets superceded at Level 1076. The item is wanted - well, i'd say it was - and, given the nature of the drop itself, it can be moulded into an Attack shield, a Defence shield, an Armor shield and a Damage shield. That, to me, says WANTED, if nothing else, because of the flexibility you have with it. I just see the problem as being one of a securing guild can't be bothered to finish it off because it will interfere with their profit_vs_investment spreadsheet.
So, I stick with my original suggestion - if you secure and don't kill, you have a week (after 2 weeks have elapsed) to finish it off, or you lose all the kills and stamina invested, and the titan just walks away, laughing
I still really don't see the point in changing the rules just because of one titan. If the item really was as "wanted" as you claim it is why aren't people finishing it off rather than letting it sit there for a month? I have yet to hear a logical explanation. Not that I'm ever even going to hunt that titan, but I still fail to see why. I can handle a few complaints from the guild who secures and is too lazy to finish the job. No sense changing all the rules.
My guess is, on this titan, that the TKP earned from finishing it off will be negligible, compared to the TKP to earn the item via 2nd-5th places ? - I don't know that for certain tho. This isn't the only titan tho, sometimes the Colossus gets secured and left too, I believe ?