Let's hope so. Athough he is curently ranked 34th on the UK all time under-23 list (though he's not 20 till the end of this month). It's interesting looking at the names of those who did and didn't 'make it' as seniors.
1:43.97: Sebastian Coe 29.09.56 1 London 15 Sep 1978
1:43.98: Peter Elliott 9.10.62 2 Oslo, NOR 23 Aug 1983
1:44.45: Steve Cram 14.10.60: 1 London 17 Jul 1982
1:44.65: Ikem Billy 25.01.64 1 Oslo, NOR 21 Jul 1984
1:44.90: Curtis Robb 7.06.72 2s2 Stuttgart, GER 15 Aug 1993
1:45.14: Chris McGeorge 13.01.62 4 Oslo, NOR 28 Jun 1983
1:45.44: Steve Ovett 9.10.55 5 Montréal, CAN 25 Jul 1976
1:45.64: Paul Herber 20.12.66 1 Derby 5 Jun 1988
1:45.70: David Sharpe 8.07.67 5 Oslo, NOR 2 Jul 1988
1:45.80: Steve Crabb 30.11.63 5 London 8 Aug 1984
1:45.80: Kevin McKay 9.02.69 3 Sheffield 15 Sep 1991
1:45.84: Garry Cook 10.01.58 4 Frankfurt am Main, GER 5 Sep 1978
1:46.0: Frank Clement 26.04.52 1 Athens, GRE 19 Jul 1973
1:46.04: Graham Williamson 15.06.60: 1 Melbourne, AUS 13 Oct 1982
1:46.05: Tom McKean 27.10.63 2 Budapest, HUN 4 Aug 1985
1:46.10: John Gladwin 7.05.63 1 Oslo, NOR 27 Jul 1985
1:46.16: Andy Carter 29.01.49 3 Helsinki, FIN 12 Aug 1971
1:46.25: Matthew Yates 4.02.69 8 Monte Carlo, MON 12 Aug 1990
1:46.37: Andrew Lill 9.08.71 6 Birmingham 28 Jun 1992
1:46.63: Peter Hoffmann 1.07.56 2 London 11 Jun 1978
1:46.8: Dave McMeekin 10.02.53 2 Paris FRA 6 Jun 1974
1:46.90: David Strang 13.12.68 3h1 Durham NC, USA 30: May 1990
1:47.00: Pete Browne 3.02.49 5 Helsinki, FIN 12 Aug 1971
1:47.00: Nick Brooks 24.10.58 2 Knoxville TN, USA 12 Apr 1980
1:47.04: Phil Norgate 15.09.61 6 London 25 Jul 1982
1:47.10: Neil Horsfield 7.12.66 1 Utrecht, NED 23 Aug 1987
1:47.0: Phil Lewis 10.11.49 4 Carmarthen 9 Aug 1969
1:47.13: Paul Larkins 19.05.63 1 Austin TX, USA 20: May 1984
1:47.20: Rob Harrison 5.06.59 5 Lausanne, SUI 14 Jul 1981
1:47.2: John Davies 17.01.49 1 Birmingham 6 May 1970
1:47.2: Tony Settle 9.12.53 1 Manchester 16 Aug 1975
1:47.2: John Griffiths 8.02.67 2 Manchester 23 Aug 1989
1:47.2: Grant Cuddy 6.01.77 2 Manchester 22 Jul 1997
1:47.22: Ricky Soos 28.06.83 1 Eton 14 Jun 2003