While I also believe that the chances for Bitcoin go to 0 tend to 0, I think that you should be aware that:
1. You should not invest by what random people over internet say.
2. You should invest only money you afford to lose. I mean that you have to think it well and have a plan for the cases (likely or not) that Bitcoin falls big. Maybe not to 0, but maybe 10k? Will you panic-sell or not?
3. You wrote "primarily in bitcoin". Keep in mind that bitcoin is a risky investment (big price fluctuations in both directions) and altcoins are even riskier.
All in all, while in theory your plan looks good, think it over a couple of times and do by your own decision.
Although OP investment strategy is good one as he want to invest in bitcoin primarily. Investment in bitcoin is more safe as compare to the altcoins. However, i don't like the idea of getting Loan for these investments because the price of bitcoin might dump and stay low in bear market, so it is always risky to invest in crypto through loans.
The good thing where he is getting loan is from his parents. So worst case scenario, he owed debt from his parents, which is better than getting a loan from sharks, which can give him so much trouble if things go wrong in bitcoin market. Even if btc is established market, still you are putting yourself at risk. The OP should think what will happen in the worst case scenario, will his parents sue him and put him to jail? If not, I believe, it is pretty safe getting loan from parents, but of course, you should always think that you will pay them on time as agreed.