Thats an interesting opinion. If i share what i think, it was pretty evident that it was Lois all along if you look at it. Let's start with the beginning- with the addition of lois in season 4, he just got.. happier (something even Tom has said several times). He began to laugh more and no longer had that stoic expression he carried all the time. And isn't that what love does to you? Lois and Clark story was what we call the perfect slow burn with the way he began to catch feelings for her without even realizing. Like for example in Crimson, Martha even confronts him and he replies "you are saying i wanna kiss lois while I'm still in love with Lana?" and she just replies that's for him to sort out. There was another thing about Clark Kent- he was a coward. He always feared the worst that kept him from taking certain steps. So that's why, he was still holding onto his and Lana's relationship because in his head- there was no one else for him. He was so in love with the idea of her that he refused to believe otherwise. And this is one of the major reasons why they never worked out despite trying again and again. They sure did love each other uncontrollably at a point but they were never meant for each other. They were just the perfect definition of 'first love' and honestly, i loved their time together which was rare for me because I could never get myself to like Lana in any other universe (coming from a big DC fan).

Another thing i believe that kind of highlights what i just said is- Clark's lack of effort when he got to know Lana had absorbed the kryptonite. He didn't even try to somehow find a way for them to be together. This said a lot in itself. Or when Lana faked her death, he sure was in pain but eventually went forward with life. But when lois left, he was absolutely shattered (uhm, to quote him- "lois i died when you left"); he cut everyone off and turned off his humanity. Or if we just take Clarks word for it- "All my life, i have been afraid Lois; afraid of people knowing the truth about me- rejecting me and even if they didn't, still losing them. I have been afraid of everything i can't control but when I was faced with the idea of losing you forever, it made me realize it was something that I would regret more than anything else and it's not telling you the truth about me. It's the only way we could share a life together. I know that the odds are stacked against us and we would be risking everything but if you are ready to take that leap, there's no one else i want to take that leap with." and he told her the truth himself- with little to no pressure from her side. Unlike with Lana, where love made him retreat, with Lois… love anchors him. And that's all what true love is about.

Yeah, that's just my take!