There is no risk in bitcoin investment. It is a profitable source for investment because now a days the price of bitcoin is increasing rapidly. Invest today and profit tomorrow :-)
How about when the coin has split? We don't know what's going to happen on August 1. We don't know how will SegWit activation affect us. The days when you can simply hold your bitcoins and earn profit after a couple of months is already over. The scaling issue is being solved and it can greatly affect the price.
Bitcoin investment is risky right now because of the new update. I want to advise that you use an altcoin to avoid the price decrease of bitcoin. When the price of bitcoin has decreased a lot after August 1, bitcoin holders will be devastated but the price of altcoins will increase. Otherwise, if altcoins' price decreased instead, then it's okay. That's the small price to pay for trying to be safe from the incoming wave.
This SegWit activation is the real pain in the ass that we are all worrying about, splitting bitcoin and stuffs that they want to happen is so confusing, of course if this thing is really going to happen on August 1, just like what you have said, it will be either the price of Altcoin will increase or the price of bitcoin will, either way, it is really risky, because any wrong choice that we are going to made is going to be regretful in the end.
Still, it will depends on us what decisions we are going to make, either we hold it or we are going with the flow with SegWit.