Name one who would come and is available?
Center forwards like Rom aren't as common as people think and they cost a fortune - the really good ones. Given we aren't in the CL we would also need to offer them more money than CL teams. Essentially the best you could do is replace him with someone not as good or as young and have maybe 10m left over to buy another decent but not spectacular player. That's not going to break us into the top 4.
I know he didn't have the greatest season but against top European opposition he showed his quality and I suspect if we where doing well in the league he would show it next season there too.
We where lucky to get Rom and we won't have him for long and we should be considering that fact this summer.
Carlos Tevez or Edin Dzeko for a lot less than 25m... I know its silly throwing figures around but we all do it. Those two are surplus to requirements at their clubs and would jump at the chance i reckon. Alexander Meier from Frankfurt is also another player who can find the back of the net. Alexandre Lacazette is another name and Hulk from Zenit would be tempted...
If we were to really go into it, would Mario mandzukic be tempted ? doubtful but we've seen stranger things happen.
Stop saying we were lucky to get Lukaku too, its cringeworthy. He isn't above Everton football club. If anyone is lucky its him; he's lucky a club was willing to pay Chelsea that kind of money, otherwise he probably would of either been out on loan again to some scabby european no mark team or playing bit part for a more established unit. Everton are not lucky to have him.