I have never like the use of he/she. If I dont know the gender I could switch to they or one.
"he/ she will face a lot of problem"
"they will face a lot of problems"
"one will face a lot of problems"
The alternative is to simply use the masculine. Use of he/she just seems too insistent on being politically correct. Its normal English usage, "All men are created equal" doesn't only refer to males. You see it in other languages too, for example French will use 'illes' to refer to mixed or unknown groups.