I personally am not going to judge Ings and Solanke on a derby game, which ninety percent of the time are cagey,lack any rhythm or cohesion [this more so at Goodison than it is at Anfield, we've won 2 matches at Goodison since 2011]
I don't think most people are judging Solanke on the derby game alone. We've had plenty of chances to see him - 23 or so, I believe, admittedly not many of them starts. And in fairness to him, he has occasionally shown good goalscoring instincts and been unlucky not to open his account. But at the same time, he hasn't shown much to indicate he can slot into our chosen system, and I very much doubt anyone would say he'd be capable of filling in for a few months if Firmino were to do a thigh muscle of whatever; it would be a huge, huge blow.
I accept that we can't afford to pay world-class players enormous salaries to accept bit-part roles, but nor does the gap have to be so large that one injury derails a season. I thought it was interesting shout one poster made about whether we should consider a Defoe type as a short-term solution: an older head who doesn't expect to be #1 but can play at the required level in short stints. It's a trade-off, and of course everyone wants a youth player that grows into a star, but I just don't think we've got the balance right with our 4th-6th forward options this season (hence my earlier shout re: Origi, who has given us a decent goal return with limited opportunities), and must thank our lucky stars for Bobby and Mo's tremendous resilience.
One way to look at this is to compare it to our midfield. We've been able to write-off pretty much entire season of Adam Lallana, and sell some little Brazilian shit whose name eludes me, and absorb a lengthy absence from Henderson, and it hasn't derailed our ambitions. Guys like Milner and Oxlade-Chamberlain have been worth their weight in gold to us: neither were first-choice to start the season, but both have played to a very high level when called upon and now we think of them as starters. We don't have anything close to that in the front third.