Are gas stations a bad investment?

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My dad made a significant amount of money buying and developing gas stations in the 90's. he's held all of them since, collecting rent checks each month, all are on a NNN lease.

He's wanting to buy more now and I personally don't think it's a great investment anymore, seeing as we're trending towards electric vehicles as more time goes on. 

While we'll still need gas for several more years, is it a good idea to invest in NNN gas stations if electric cars become more prominent as the years go on? Is my perspective on this matter wrong?

Note: We live in California and gas stations are selling at a premium right now, prices are CRAZY!!